You may know Ed Helms from The Daily Show, The Office and The Hangover movies. But the actor and comedian is also a history buff. And he thinks there's a lot we can learn – and laugh about – by delving into history's greatest, zaniest and funniest screw-ups. Helms explores those stories in his podcast and book SNAFU. He joins Piya Chattopadhyay to share some of his favourites – from a CIA plot to make Fidel Castro's beard fall out, to a nuclear scare in Canada where a 20-something future-president named Jimmy Carter saved the day.